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4. During which period did the first modern birds appear? Estimate the date in millions of years (Ma).
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4. During which period did the first modern birds appear? Estimate the date in millions of years (Ma).

User GeoNomad
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Answer:

Cretaceous period

Step-by-step explanation:

Fossil records suggest that modern birds originated 60 million years ago, after the end of the Cretaceous period about 65 million years ago when dinosaurs died off

User Losee
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